Improvement in petroleum-stoves



T. C. HARGRAV ES.

Petroleum Stove.

No. 50,821. Patented Nov. 7, 1865.

UNITED STATES PATENT OFFICE.

THOMAS C. HARGRAVE, OF BOSTON, MASSACHUSETTS.

IMPROVEMENT IN PETROLEUM-STOVES.'

Specification forming part of Letters Patent N0. 50,S2 l dated November7, 1865.

To all whom it may concern:

Be it known that I, THoMAs O. HARGRAVE, of Boston,in the county ofSuffolk and State of Massachusetts, have invented a new Improvement inPetroleum or Vapor Stoves; and I hereby declare that the following is afull and exact description thereof, reference being had to theaccompanying drawings, and to the letters of reference marked thereon,making a part of this specification, of which Figure l is a side view ofthe vapor-stove, showing the position of the stove and the reservoircontaining the material generating the vapor or gas. Fig. 2 is a bottomview of the same. Fig. 3 is atop viewof the same; andFig. 4 is a sectionof the heating-chamber, the vaporizer, the jet-tube, a part of thesupply and pressure pipes, and also a part of the reservoir.

A represents the heating or cooking chamher; a, the floor or base of theheating chamher A; B, the Nopha reservoir; 1) b, the supply and pressurepipes; c, the vaporizer; 6, its jet-tube; d, the air-mixer orblast-plate; ff,- cocks in the pipes b I).

Now, in order that others may better under- .stand the nature and use ofmy invention and be enabled to construct the same, I will proceed toexplain it.

In petroleum or vapor stoves the reservoir or can which holds the liquidwhich is to be generated into vapor or gas is placed at a considerableheight above the stove, or a little on one side, and is connected withthe vaporizer by a bent tube, which also supports the reservoir or can.Now, this reservoir is placed thus highabout four feet--chiefly in orderthat there may be a sufficient pressure of the liquid to force the jet.of vapor or gas generated in the vaporizer in a steady flow into theflame through thejet-tube; and this tube, moreover, is the only supportofthe reservoir. Now, then, I propose to do away with this unsightly,precarious, and often very inconvenient mode of perching a reservoirupon a long tube, and I do it in this way:

By referring to Fig. lit will be perceived that the bottom of thereservoir or can B, containing the liquid to be generated into vapor orgas, is on a level or little lower than the heating-chamber a, so thatthe supply-pipe I), issuing from the bottom of the reservoir, is on alevel with the vaporizer. This reservoir is also supported by a leg, asseen in said figure. I therefore place the reservoir right behind thestove, where it is neither unsightly nor in the way, nor liable to haveits connecting-tube bent or otherwise injured.

In order to compensate the pressure which the height of the ordinaryreservoir gives, I have constructedapressure-pipe. (Marked b in theaccompanying drawings.) This pressurepipe enters the vaporizer oppositeand on a level with, and in precisely the same manner as the supply-pipeI) does, which is clearly seen in Fig. 3. It also extends to and entersthe top of the reservoir, having a stop-cock,f, between the reservoirand the stove. The supply-pipe 1) issues from the bottom of thereservoir, and is connected with the vaporizer, in the manner seen inFig. 3, having the supplypipe I), through which the liquid flows fromthe reservoir to the vaporizer.

I will explain how my pressure-pipe b operates and takes the place ofthe downward pressure obtained in the old way by placing the reservoirhigh on a tube.

I heat the vaporizer in the usual way, and then by turning the cock inthe supply-pipe the liquid flows into the vaporizer. This is instantlyconverted into vapor or gas, and the vapor pressing in all directions,and the jettube being very small, only a very small portion of the vaporformed would be forced through it into the flame. There being no escape,the vapor would be forced back into the supply-pipe, and thus preventthe liquid from flowing into the vaporizer. To overcome thisback-pressure of the vapor in the old way it was found necessary toelevate the reservoir about four feet, as before stated; but mypressure-pipe exactly meets this difficulty. The surplus vapor, escapingthrough the pressure-pipe and pressing equally in all directions, flowsinto the top of the reservoir, when it is absorbed in the liquid, andthe liquid, of its own motion, flows down toward the vaporizer, theamount of which is regulated by the stop-cock in the supply-pipe, thevapor also being regulated by the stop-cock in the pressure-pipe.

A piece of soapstone or other non-conductor maybe placed between thestove and reservoir, if necessary.

What I claim as my invention, and desire to secure by Letters Patent, is

The pressure-pipe 1), connecting the reservoir with the vaporizer,substantially as and for the purpose above set forth.

NVitnesses; T. O. HARGRAVE.

J. L. NEWTON, G. L. VEsrY.

